You might check out the Unofficial AR18/180 Website. I believe they have a message-board-type section where folks can exchange info.
ArmaLite lists AR180 parts on their website, but from what I understand, there seems to be some dispute in regards to whether or not the parts are actually being manufactured. You might give them a holler to get the scoop.
Bulldog- I called ArmaLite. They have NOTHING for the AR180 eexcept a few springs. I'll try the U-O website, but I think this is going to be a toughy. Thanks for your help.
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"middle of the road"-where a yellow streak and dead carcasses are found.